AP EAMCET Engineering 17 Sep 2020 Shift 2 Paper

When a rectangular coil is rotated in a uniform magnetic field about an axis passing through its centre and perpendicular to field, then magnetic flux associated with coil is given as
φ=BA‌cos‌θ=BA‌cos‌ω‌t....(i)
∴ Induced emf, e=−‌

dφ

dt

=−‌

d

dt

BA‌cos‌ω‌t
[From Eq. (i)]
=+BAω‌sin‌ω‌t
⇒‌‌e=e0‌sin‌ω‌t....(ii)
where, e0 is the peak value of induced emf.
i.e. ‌‌e0=BAω
From Eq. (ii) it is clear that, induced emf varies sinusoidally.